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W27E020 Datasheet(PDF) 3 Page - Winbond

Part # W27E020
Description  256K X 8 ELECTRICALLY ERASABLE EPROM
Download  14 Pages
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W27E020 Datasheet(HTML) 3 Page - Winbond

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Preliminary W27E020
Publication Release Date: December 1997
- 3 -
Revision A1
Standby Mode
The standby mode significantly reduces VCC current. This mode is entered when CE = VIH. In
standby mode, all outputs are in a high impedance state, independent of OE and PGM .
Two-line Output Control
Since EPROMs are often used in large memory arrays, the W27E020 provides two control inputs for
multiple memory connections. Two-line control provides for lowest possible memory power
dissipation and ensures that data bus contention will not occur.
System Considerations
EPROM power switching characteristics require careful device decoupling. System designers are
concerned with three supply current issues: standby current levels (ISB), active current levels (ICC),
and transient current peaks produced by the falling and rising edges of CE. Transient current
magnitudes depend on the device output's capacitive and inductive loading. Two-line control and
proper decoupling capacitor selection will suppress transient voltage peaks. Each device should have
a 0.1
µF ceramic capacitor connected between its VCC and GND. This high frequency, low inherent-
inductance capacitor should be placed as close as possible to the device. Additionally, for every eight
devices, a 4.7
µF electrolytic capacitor should be placed at the array's power supply connection
between VCC and GND. The bulk capacitor will overcome voltage slumps caused by PC board trace
inductances.
TABLE OF OPERATING MODES
VPP = 12V, VPE = 14V, VHH = 12V, VCP = 5V, VCE = 5V, VID = 14V, X = VIH or VIL
MODE
PINS
CE
OE
PGM
A0
A9
VCC
VPP
OUTPUTS
Read
VIL
VIL
X
X
X
VCC
VCC
DOUT
Output Disable
VIL
VIH
X
X
X
VCC
VCC
High Z
Standby (TTL)
VIH
X
X
X
X
VCC
VCC
High Z
Standby (CMOS)
VCC
±0.3V
X
X
X
X
VCC
VCC
High Z
Program
VIL
VIH
VIL
X
X
VCP
VPP
DIN
Program Verify
VIL
VIL
VIH
X
X
VCC
VPP
DOUT
Program Inhibit
VIH
X
X
X
X
VCP
VPP
High Z
Erase
VIL
VIH
VIL
VIL
VID
VCE
VPE
FF (Hex)
Erase Verify
VIL
VIL
VIH
X
X
VCC
VPE
DOUT
Erase Inhibit
VIH
X
X
X
X
VCE
VPE
High Z
Product Identifier-
manufacturer
VIL
VIL
X
VIL
VHH
VCC
VCC
DA (Hex)
Product Identifier-device
VIL
VIL
X
VIH
VHH
VCC
VCC
85 (Hex)


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